Can you run the command
sudo /usr/lib/cups/backend/usb
and post its output here?
If it does not output anything, or anything not containing manufacturer and model names of your printer, post also what got added to /var/log/syslog by this command.
Can you run the command
sudo /usr/lib/ cups/backend/ usb
and post its output here?
If it does not output anything, or anything not containing manufacturer and model names of your printer, post also what got added to /var/log/syslog by this command.